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#1 |
Resident Lurker
Join Date: Apr 2005
Location: Forney, TX
Posts: 205
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250 I6 to 350 v8: Engine Towers Placement?
I've been working on my '72 all day getting it ready for the motor swap...the I6 and three speed manual are out and I'm close to dropping the V8 in, but have a question.
Which set of holes do I install the V8 towers in? And more importantly, I'm not sure which tower is for the left, and which is for the right. I've tried each tower on each side, both in the forward holes and the rear holes and I can't get the bottom bolt hole in the tower to line up with either of the holes in the crossmember. I can get it close in the forward holes, with the bottom bolt hole just slightly in alignment. I bought the V8 towers from a member on here, so I'm pretty sure they are the correct ones. (Excuse the cell phone photos please) This first pic is looking down at the pass side tower in the forward holes. ![]() This pic is the same tower, in the same position...the bottom tower hole only partially lines up with the forward hole in the crossmember. ![]() Assuming I have the towers on the correct side and the forward holes are what I use, do I just put bolts in the top holes and force the tower toward the frame a little to get the bottom hole to line up?
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The Rotten Mule: '72 Chevy Short Step Project- http://67-72chevytrucks.com/vboard/s...d.php?t=417252 "Every normal man must be tempted at times to spit on his hands, hoist the black flag, and begin to slit throats."- H.L. Mencken Last edited by Boyd; 07-17-2010 at 06:55 PM. Reason: added pic |
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#2 |
Registered User
Join Date: Jun 2008
Location: Moss Point,Ms.
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Re: 250 I6 to 350 v8: Engine Towers Placement?
Mines a V-8 and I just pulled the towers off today!
You have them in the right position,so just push it till the hole lines up. Mike. |
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#3 |
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Re: 250 I6 to 350 v8: Engine Towers Placement?
thanks. I got the towers in, now I hit another snag.
What size are the bolts that connect the transmission to the engine? th350 to 350.
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The Rotten Mule: '72 Chevy Short Step Project- http://67-72chevytrucks.com/vboard/s...d.php?t=417252 "Every normal man must be tempted at times to spit on his hands, hoist the black flag, and begin to slit throats."- H.L. Mencken |
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#4 |
Senior Member
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Re: 250 I6 to 350 v8: Engine Towers Placement?
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#5 |
Registered User
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Location: frederick, md
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Re: 250 I6 to 350 v8: Engine Towers Placement?
I'm about ready to do the same swap...250 to 350. Did you move the mounts forward, or leave the V8 sitting close to the firewall? I'm still trying to make this decision.
Any tips or list of parts you had to gather up for the swap? I have the 4 speed manual... Tom |
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#6 |
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Re: 250 I6 to 350 v8: Engine Towers Placement?
more pics nd info would be great on this subjects guys. Brandon
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#7 |
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Re: 250 I6 to 350 v8: Engine Towers Placement?
bump
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#8 | |
Resident Lurker
Join Date: Apr 2005
Location: Forney, TX
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Re: 250 I6 to 350 v8: Engine Towers Placement?
Quote:
I placed the mounts in the existing forward holes and the engine installed easily. However, after installing the engine and auto trans, the drive shaft is now about 4-5 inches short. At first I thought it was due to the trans being a short tail version, but I was told that our trucks came originally with short tail automatics. This issue is confusing to me because I've seen others use the forward mounting holes and their drive shaft bolts right up with no problems, but for some reason mine doesn't. I plan on taking measurements and finding a correct length shaft from a junk yard. Or I'll get one a little long and have it shortened. If you are going to use a 4spd man then you shouldn't have to worry about any other parts besides the V8 towers and a 4spd shifter, which will need to be mounted on the floor. Unfortunately I didn't take any more pics of the swap, so I can't help there, but since I just did it recently I could probably answer some questions you might have.
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The Rotten Mule: '72 Chevy Short Step Project- http://67-72chevytrucks.com/vboard/s...d.php?t=417252 "Every normal man must be tempted at times to spit on his hands, hoist the black flag, and begin to slit throats."- H.L. Mencken |
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#9 |
State of Confusion!
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Re: 250 I6 to 350 v8: Engine Towers Placement?
Yes the drive shaft is longer for the V8/T350 trucks.. I have been told that if you used the 6 cylinder towers for the V8/T350, it slides it back so that the driveshaft is the same length as the 6/3speed.
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Bill 1970 Chevy Custom/10 LWB Fleetside 2010 Toyota Tacoma PreRunner SR5 Double Cab - DD Member of Louisiana Classic Truck Club (LCTC) Bill's Gallery Life isn't tied with a bow, but it's still a gift. Live simply. Love generously. Care deeply. Speak kindly. Leave the rest to God! |
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#10 |
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Re: 250 I6 to 350 v8: Engine Towers Placement?
Boyd,when I told you where to put the towers,I forgot to mention that mine is a turbo-400 trans.
Sorry for any problem I may have caused you! Mike. |
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#11 |
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Location: Old Bridge,NJ
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Re: 250 I6 to 350 v8: Engine Towers Placement?
Hay fellows I just got done with the help of a friend swaping out my three speed for a turbo 350 on my I6 . I know it's not the same but the problem I came across is the auto trans rod to shift link on the streeing column is not the same. I need the longer bent one the three speed one is shorter and straight and also now my speedo cable is short . Luckily my original one piece drive shaft fit . My truck is a short bed . Boyd is your truck a long or short bed I was wondering if four more inches needed will make a difference one or two piece drive shaft. Also Boyd and tp85 your speedo cable might need to be change. I'm sure someone could help out . Hope to help. Nick
Last edited by NGN; 08-08-2010 at 02:32 PM. |
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#12 | |||
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Re: 250 I6 to 350 v8: Engine Towers Placement?
Quote:
Quote:
Quote:
Thanks guys.
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The Rotten Mule: '72 Chevy Short Step Project- http://67-72chevytrucks.com/vboard/s...d.php?t=417252 "Every normal man must be tempted at times to spit on his hands, hoist the black flag, and begin to slit throats."- H.L. Mencken |
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#13 |
State of Confusion!
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Re: 250 I6 to 350 v8: Engine Towers Placement?
Some of the SWB trucks (V8/Auto) came with 2 piece drive shafts also.
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Bill 1970 Chevy Custom/10 LWB Fleetside 2010 Toyota Tacoma PreRunner SR5 Double Cab - DD Member of Louisiana Classic Truck Club (LCTC) Bill's Gallery Life isn't tied with a bow, but it's still a gift. Live simply. Love generously. Care deeply. Speak kindly. Leave the rest to God! |
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#14 |
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Re: 250 I6 to 350 v8: Engine Towers Placement?
So you can use the 6 cylinder mounts and move them forward in a 350 swap for a 67-72 C10 correct?
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#15 | |
Big Red - Now its a SWB!
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Re: 250 I6 to 350 v8: Engine Towers Placement?
Quote:
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#16 |
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Re: 250 I6 to 350 v8: Engine Towers Placement?
Could you move the straight 6 mounts forward and mount the engine then?
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#17 |
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Re: 250 I6 to 350 v8: Engine Towers Placement?
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#18 |
Big Red - Now its a SWB!
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Re: 250 I6 to 350 v8: Engine Towers Placement?
The I6 towers won't line up with the front holes so you would have to modify them to work. The small block towers will line up with the front holes, so if you swap to the small block and want to move it to the stock location you would be better off using these.
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68 3/4 ton ![]() ![]() 41 3/4 ton ![]() 01 Tahoe LT 4WD (my daily driver)-Magnaflow Muffler, Rollin on 22's 02 Ford Mustang Convertable (Wife's Car)-Flowmaster 50, Clear corners, Intake, sittin on 18's |
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#19 |
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Re: 250 I6 to 350 v8: Engine Towers Placement?
Sorry, I finally see what you are asking about. Jacfourteen is of course correct. If you move the brackets to the forward set of holes, you need to drill a new hole in the crossmember.
Ray Last edited by raycow; 08-26-2010 at 09:10 PM. |
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#20 |
Cruzin
Join Date: Dec 2009
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Re: 250 I6 to 350 v8: Engine Towers Placement?
mine is in the inline position too no problems i have the 4x4 fan shroud and hei dizzy
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#21 |
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Re: 250 I6 to 350 v8: Engine Towers Placement?
Ok, I have read this thread 3 times and am thorougly confused. When going from the 6 to the 350 do you need to move the I-6 towers if your using HEI? Also when doing this swap from an I-6/3 speed to a 350/4 speed will a one piece driveshaft work or will I have to switch to a 2 piece driveshaft? and final note its a long bed
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#22 | |
Big Red - Now its a SWB!
Join Date: Jun 2009
Location: Oroville, Ca
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Re: 250 I6 to 350 v8: Engine Towers Placement?
Quote:
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68 3/4 ton ![]() ![]() 41 3/4 ton ![]() 01 Tahoe LT 4WD (my daily driver)-Magnaflow Muffler, Rollin on 22's 02 Ford Mustang Convertable (Wife's Car)-Flowmaster 50, Clear corners, Intake, sittin on 18's |
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#23 |
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Re: 250 I6 to 350 v8: Engine Towers Placement?
A car 4 speed is the same length as the 3 speed, but the truck 4 speed is all by itself. It does not use a slip yoke. Instead, it has a yoke bolted solidly to the output shaft, something like the pinion yoke on a rear end. The 4 speed driveshaft has a slip joint behind the front U-joint and looks similar (except for length) to the shafts used on the 4WD trucks.
Ray Last edited by raycow; 08-31-2010 at 01:52 AM. |
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#24 | |
Big Red - Now its a SWB!
Join Date: Jun 2009
Location: Oroville, Ca
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Re: 250 I6 to 350 v8: Engine Towers Placement?
Quote:
__________________
68 3/4 ton ![]() ![]() 41 3/4 ton ![]() 01 Tahoe LT 4WD (my daily driver)-Magnaflow Muffler, Rollin on 22's 02 Ford Mustang Convertable (Wife's Car)-Flowmaster 50, Clear corners, Intake, sittin on 18's |
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